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mic5321 dual, high performance 150ma cap uldo? uldo is a trademark of micrel, inc. mlf and micro leadframe are registered trademarks of amkor technology, inc. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? te l +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micre l.com may 2008 m9999-051508-e general description the mic5321 is a tiny dual ultra low-dropout (uldo?) linear regulator ideally suited for those applications that requir e high psrr because it provides a bypass pin fo r those noise sensitive portable electronics. the mic5321 integrates two high-performance; 150ma ul dos into a very compact 1.6mm x 1.6mm leadless thin mlf ? package that provides exceptional therma l package characteristics. the mic5321 is a cap design which enables operation with very small ceramic output capacitors for stability, thereby reduc ing required board space and component cost. the combination of extremely low-drop-out voltage, ve ry high power supply rejection, very low output noise and exceptional thermal package characteristics makes it ideal for powering rf application, cellular phone camera modules, imaging sensors for digital still cameras, pdas, mp3 players and webcam applications. the mic5321 uldo? is available in fixed-output voltages in the tiny 6-pin 1.6mm x 1.6mm leadless thin mlf ? package which is only 2.56mm 2 in area, less than 30% the area of the sot-23, tsop and mlf ? 3x3 packages. it?s also available in the thin sot-23-6 lead package and the standard 6-pin 1.6mm x 1.6mm leadless package. additional voltage options are available. for more information, contact micrel marketing department. data sheets and support documentation can be found on micrel?s web site at www.micrel.com. features ? 2.3v to 5.5v input voltage range ? ultra-low dropout voltage uldo? 35mv @ 150ma ? tiny 6-pin 1.6mm x 1.6mm thin mlf ? leadless package ? low cost tsot-23-6 package ? bypass pin for improv ed noise performance ? high psrr ? >75db on each ldo ? ultra low noise output - > 30vrms ? dual 150ma outputs ? cap stable with 1f ceramic capacitor ? low quiescent current ? 150a ? fast turn-on time ? 45s ? thermal shutdown protection ? current limit protection applications ? mobile phones ? pdas ? gps receivers ? portable electronics ? portable media players ? digital still an d video cameras typical application vin en vout 1 vout 2 gnd mic5321-x.xyml 1f 0.01f byp 1f rx/synth tx rf transceiver 1f rf power supply circuit
micrel, inc. mic5321 may 2008 2 m9999-051508-e ordering information part number manufacturing part number marking* voltage** junction temp. range package mic5321-1.8/1.5ymt mic5321-gfymt bgf 1.8v /1.5v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-1.8/1.8ymt mic5321-ggymt bgg 1.8v /1.8v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-1.8/1.6ymt mic5321-gwymt bgw 1.8v /1.6v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.5/1.8ymt mic5321-jgymt bjg 2.5v/1 .8v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.5/2.5ymt mic5321-jjymt bjj 2.5v /2.5v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.6/1.85ymt mic5321-kdymt bkd 2.6v /1.85 ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.6/1.8ymt mic5321-kgymt bkg 2.6v/1 .8v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.7/2.7ymt mic5321-llymt bll 2.7v /2.7v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.8/1.5ymt mic5321-mfymt bmf 2.8v /1.5v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.8/1.8ymt mic5321-mgymt bmg 2.8v /1.8v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.8/2.6ymt mic5321-mkymt bmk 2.8v /2.6v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.8/2.8ymt mic5321-mmymt bmm 2.8v /2.8v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.85/1.85ymt mic5321-ndymt bnd 2.85v/1 .85v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.85/2.6ymt mic5321-nkymt bnk 2.85v /2.6v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.85/2.85ymt mic5321-nnymt bnn 2.85v/2 .85v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.9/1.5ymt mic5321-ofymt bof 2.9v /1.5v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.9/1.8ymt mic5321-ogymt bog 2.9v /1.8v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.9/2.9ymt mic5321-ooymt boo 2.9v /2.9v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.0/1.8ymt mic5321-pgymt bpg 3.0v /1.8v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.0/2.5ymt mic5321-pjymt bpj 3.0v /2.5v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.0/2.6ymt mic5321-pkymt bpk 3.0v/2 .6v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.0/2.8ymt mic5321-pmymt bpm 3.0v /2.8v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.0/2.85ymt mic5321-pnymt bpn 3.0v/2 .85v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.0/3.0ymt mic5321-ppymt bpp 3.0v/3 .0v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.3/1.5ymt mic5321-sfymt bsf 3.3v /1.5v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.3/1.8ymt mic5321-sgymt bsg 3.3v /1.8v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.3/2.5ymt mic5321-sjymt bsj 3.3v /2.5v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.3/2.6ymt mic5321-skymt bsk 3.3v/2 .6v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.3/2.7ymt mic5321-slymt*** bsl 3.3v /2.7v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.3/2.8ymt mic5321-smymt bsm 3.3v/2 .8v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.3/2.85ymt mic5321-snymt bsn 3.3v/2 .85v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.3/2.9ymt mic5321-soymt bso 3.3v /2.9v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.3/3.0ymt mic5321-spymt bsp 3.3v/3 .0v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.3/3.2ymt mic5321-srymt bsr 3.3v /3.2v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-3.3/3.3ymt mic5321-ssymt bss 3.3v/3 .3v ?40c to +125c 6-pin 1.6x1.6 thin mlf ? mic5321-2.8/1.5yml mic5321-mfyml bmf 2. 8v/1.5v ?40c to +125c 6-pin 1.6x1.6 mlf ? mic5321-2.8/1.8yml mic5321-mgyml bmg 2. 8v/1.8v ?40c to +125c 6-pin 1.6x1.6 mlf ? mic5321-2.8/2.8yml mic5321-mmyml bmm 2. 8v/2.8v ?40c to +125c 6-pin 1.6x1.6 mlf ? mic5321-3.0/3.0yml mic5321-ppyml bpp 3.0v /3.0v ?40c to +125c 6-pin 1.6x1.6 mlf ?
micrel, inc. mic5321 may 2008 3 m9999-051508-e part number manufacturing part number marking* voltage** junction temp. range package mic5321-1.8/1.5yd6 mic5321-gfyd6 qb gf 1.8v/1.5v ?40c to +125c 6-pin tsot-23 mic5321-1.8/1.8yd6 mic5321-ggyd6 qb gg 1.8v/1.8v ?40c to +125c 6-pin tsot-23 mic5321-1.8/1.6yd6 mic5321-gwyd6*** qb gw 1.8v/1.6v ?40c to +125c 6-pin tsot-23 mic5321-2.5/1.8yd6 mic5321-jgyd6*** qb jg 2.5v/1.8v ?40c to +125c 6-pin tsot-23 mic5321-2.5/2.5yd6 mic5321-jjyd6*** qb jj 2.5v/2.5v ?40c to +125c 6-pin tsot-23 mic5321-2.6/1.85yd6 mic5321-kdyd6*** qb kd 2.6v/1.85 ?40c to +125c 6-pin tsot-23 mic5321-2.6/1.8yd6 mic5321-kgyd6*** qb kg 2.6v/1.8v ?40c to +125c 6-pin tsot-23 mic5321-2.7/2.7yd6 mic5321-llyd6 qb ll 2.7v/2.7v ?40c to +125c 6-pin tsot-23 mic5321-2.8/1.5yd6 mic5321-mfyd6 qb mf 2.8v/1.5v ?40c to +125c 6-pin tsot-23 mic5321-2.8/1.8yd6 mic5321-mgyd6 qb mg 2.8v/1.8v ?40c to +125c 6-pin tsot-23 mic5321-2.8/2.6yd6 mic5321-mkyd6 qb mk 2.8v/2.6v ?40c to +125c 6-pin tsot-23 mic5321-2.8/2.8yd6 mic5321-mmyd6 qb mm 2.8v/2.8v ?40c to +125c 6-pin tsot-23 mic5321-2.85/1.85yd6 mic5321-ndyd6*** qb nd 2.85v/1.85v ?40c to +125c 6-pin tsot-23 mic5321-2.85/2.6yd6 mic5321-nkyd6*** qb nk 2.85v/2.6v ?40c to +125c 6-pin tsot-23 mic5321-2.85/2.85yd6 mic5321-nnyd6*** qb nn 2.85v/2.85v ?40c to +125c 6-pin tsot-23 mic5321-2.9/1.5yd6 mic5321-ofyd6*** qb of 2.9v/1.5v ?40c to +125c 6-pin tsot-23 mic5321-2.9/1.8yd6 mic5321-ogyd6*** qb og 2.9v/1.8v ?40c to +125c 6-pin tsot-23 mic5321-2.9/2.9yd6 mic5321-ooyd6*** qb oo 2.9v/2.9v ?40c to +125c 6-pin tsot-23 mic5321-3.0/1.8yd6 mic5321-pgyd6 qb pg 3.0v/1.8v ?40c to +125c 6-pin tsot-23 mic5321-3.0/2.5yd6 mic5321-pjyd6*** qb pj 3.0v/2.5v ?40c to +125c 6-pin tsot-23 mic5321-3.0/2.6yd6 mic5321-pkyd6*** qb pk 3.0v/2.6v ?40c to +125c 6-pin tsot-23 mic5321-3.0/2.8yd6 mic5321-pmyd6*** qb pm 3.0v/2.8v ?40c to +125c 6-pin tsot-23 mic5321-3.0/2.85yd6 mic5321-pnyd6*** qb pn 3.0v/2.85v ?40c to +125c 6-pin tsot-23 mic5321-3.0/3.0yd6 mic5321-ppyd6 qb pp 3.0v/3.0v ?40c to +125c 6-pin tsot-23 mic5321-3.3/1.5yd6 mic5321-sfyd6*** qb sf 3.3v/1.5v ?40c to +125c 6-pin tsot-23 mic5321-3.3/1.8yd6 mic5321-sgyd6*** qb sg 3.3v/1.8v ?40c to +125c 6-pin tsot-23 mic5321-3.3/2.5yd6 mic5321-sjyd6 qb sj 3.3v/2.5v ?40c to +125c 6-pin tsot-23 mic5321-3.3/2.6yd6 MIC5321-SKYD6*** qb sk 3.3v/2.6v ?40c to +125c 6-pin tsot-23 mic5321-3.3/2.7yd6 mic5321-slyd6*** qb sl 3.3v/2.7v ?40c to +125c 6-pin tsot-23 mic5321-3.3/2.8yd6 mic5321-smyd6*** qb sm 3.3v/2.8v ?40c to +125c 6-pin tsot-23 mic5321-3.3/2.85yd6 mic5321-snyd6*** qb sn 3.3v/2.85v ?40c to +125c 6-pin tsot-23 mic5321-3.3/2.9yd6 mic5321-soyd6*** qb so 3.3v/2.9v ?40c to +125c 6-pin tsot-23 mic5321-3.3/3.0yd6 mic5321-spyd6*** qb sp 3.3v/3.0v ?40c to +125c 6-pin tsot-23 mic5321-3.3/3.2yd6 mic5321-sryd6*** qb sr 3.3v/3.2v ?40c to +125c 6-pin tsot-23 mic5321-3.3/3.3yd6 mic5321-ssyd6 qb ss 3.3v/3.3v ?40c to +125c 6-pin tsot-23 notes * under bar ( _ )/over bar ( ) symbol may not be to scale. thin mlf (mt) package pin 1 identified = . ** for other voltages available. contact micrel for more details. *** contact micrel marketing for availability.
micrel, inc. mic5321 may 2008 4 m9999-051508-e pin configuration 1 vin gnd byp 6 vout1 vout2 en 5 4 2 3 vin gnd vout1 en byp 3 1 6 2 45 vout2 6-pin 1.6mm x 1.6mm thin mlf (mt) / mlf (ml) top view tsot-23-6 (d6) top view pin description pin number thin mlf-6 / mlf-6 pin number tsot-23-6 pin name pin function 1 3 vin supply input. 2 2 gnd ground 3 1 byp reference bypass: connect external 0.0 1f to gnd to reduce output noise. may be left open. 4 6 en enable input (both regulators): acti ve high input. logic high = on; logic low = off; do not leave floating. 5 5 vout2 regulator output ? ldo2 6 4 vout1 regulator output ? ldo1 hs pad ? epad exposed heatsink pa d connected to ground internally.
micrel, inc. mic5321 may 2008 5 m9999-051508-e absolute maximum ratings (1) supply voltage (v in ) .....................................0v to +6v enable input voltage (v en )...........................0v to +6v power dissipation???????.internally limited (3) lead temperature (solde ring, 3sec ) ..................260c storage temperature (t s ) ................ ?65c to +150c esd rating (4) .........................................................2kv operating ratings (2) supply voltage (v in ) .............................. +2.3v to +5.5v enable input voltage (v en ).............................. 0v to v in junction temperature (t j ) ................. ?40c to +125c junction thermal resistance thin mlf-6 / mlf-6 ( ja ) ....................... 100 c/w tsot-6 ( ja ) ........................................... 235 c/w electrical characteristics (5) v in = en = v out + 1.0v; higher of the two regulator outputs, i outldo1 = i outldo2 = 100a; c out1 = c out2 = 1f; c byp = 0.01f; t j = 25c, bold values indicate ?40c t j +125c, unless noted. parameter conditions min typ max units variation from nominal v out -2.0 +2.0 % output voltage accuracy variation from nominal v out ; ?40c to +125c -3.0 +3.0 % line regulation v in = v out + 1v to 5.5v; i out = 100a 0.02 0.3 0.6 %/v %/v load regulation i out = 100a to 150ma 0.5 2.0 % dropout voltage (6) i out = 100a i out = 50ma i out = 100ma i out = 150ma 0.1 12 25 35 50 75 100 mv mv mv mv ground current en = high; i out1 = 150ma, i out2 = 150ma 150 190 a ground current in shutdown en1 0.2v 0.01 2 a ripple rejection f = 1khz; c out = 1.0f; c byp = 0.1f f = 20khz; c out = 1.0f; c byp = 0.1f 75 45 db db current limit v out = 0v 300 550 950 ma output voltage noise c out = 1.0f; c byp = 0.01f; 10hz to 100khz 30 v rms enable inputs (en) logic low 0.2 v enable input voltage logic high 1.1 v v il 0.2v 0.01 1 a enable input current v ih 1.0v 0.01 1 a turn-on time (see timing diagram) turn-on time (ldo1 and 2) c out = 1.0f; no c byp c out = 1.0f; c byp = 0.01f 40 45 100 100 s s notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. the maximum allowable power dissipation of any t a (ambient temperature) is p d(max) = (t j(max) ? t a ) / ja . exceeding the maximum allowable power dissipation will result in excessive die te mperature, and the regulator will go into thermal shutdown. 4. devices are esd sensitive. handling precautions re commended. human body model, 1.5k in series with 100pf. 5. specification for packaged product only. 6. dropout voltage is defined as the input-to-output differentia l at which the output voltage drops 2% below it?s nominal v out . for outputs below 2.3v, the dropout voltage is the input-to-output differential with the minimum input voltage 2.3v
micrel, inc. mic5321 may 2008 6 m9999-051508-e functional diagram en enable reference ldo1 ldo2 byp vin vout 1 vout 2 gnd mic5321 block diagram
micrel, inc. mic5321 may 2008 7 m9999-051508-e typical characteristics 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 power supply rejection ratio 1 frequency (khz) 0.1 10 100 1,000 v in = v out +1v v out = 2.8v c out = 1f c byp = 0.1f 50ma 150ma 0 5 10 15 20 25 30 35 40 0 25 50 75 100 125 150 output current (ma) dropout voltage vs. output current v out = 2.8v c out = 1f v in = v out + 1v en = v in 2.50 2.55 2.60 2.65 2.70 2.85 2.90 2.95 3.00 output voltage vs. temperature 20 40 60 80 temperature (c) 2.75 2.80 v in = v out + 1v v out = 2.8v c out = 1f en = v in 120 125 130 140 145 150 155 160 20 40 60 80 temperature (c) ground current vs. temperature 100a v in = v out + 1v v out = 3v c out = 1f en = v in 135 120 125 130 145 150 155 160 ground current vs. temperature 20 40 60 80 temperature (c) 150ma v in = v out + 1v v out = 3v c out = 1f en = v in 135 140 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0123456 input voltage (v) output voltage vs. input voltage 2.8v 1.5v 2.5 i out = 100a c out = 1f 35 40 45 50 dropout voltage vs. temperature 20 40 60 80 temperature (c) 100a 10ma 50ma 100ma 150ma v in = v out + 1v v out = 2.8v c out = 1f 5 10 15 20 25 30 0 2.70 2.75 2.80 2.85 2.90 0 25 50 75 100 125 150 output current (ma) output voltage vs. output current v in = v out + 1v v out = 2.8v c out1 = c out2 = 1f en = v in 1.40 1.45 1.50 1.55 1.60 0 25 50 75 100 125 150 output current (ma) output voltage vs. output current v in = v out + 1v v out = 1.5v c out1 = c out2 = 1f en = v in 138 142 146 150 154 158 162 0 25 50 75 100 125 150 output current (ma) ground current vs. output current v in = v out + 1v v out = 2.85v en = v in c out1 = c out2 = 1f 510 520 530 540 550 560 570 580 590 600 610 3 3.5 4 4.5 5 5.5 input voltage (v) current limit vs. input voltage en = v in c out = 1f 0.001 0.01 0.1 1 10 output noise spectral density 1 frequency (khz) 0.1 0.01 10 100 1,000 10,000 v in = 3.8v v out = 2.8v c out = 1f c byp = 0.01f
micrel, inc. mic5321 may 2008 8 m9999-051508-e functional characteristics enable turn-on enable (1v/div) vout2 (1v/div) time (10s/div) vout1 (1v/div) v in = v out + 1v v out1 = v out2 = 3.0v c out = 1f c byp = 0.1f load transient output volta g e (20mv/div) output current (50ma/div) time (40s/div) v in = v out + 1v v out = 2.8v c out = 1f 150ma 10ma c byp = 0.1f line transient input volta g e (2v/div) output volta g e (50mv/div) time (40s/div) v in = v out + 1v v out = 2.8v c out = 1f i out = 10ma 5.5v 4v
micrel, inc. mic5321 may 2008 9 m9999-051508-e applications information enable/shutdown the mic5321 comes with a single active-high enable pin that allows both regulators to be disabled simultaneously. forcing th e enable pin low disables the regulator and sends it into a ?zero? off-mode- current state. in this state, current consumed by the regulator goes nearly to zero. forcing the enable pin high enables the output voltage. the active-high enable pin uses cmos technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. input capacitor the mic5321 is a high-performance, high bandwidth device. therefore, it requ ires a well-bypassed input supply for optimal performance. a 1f capacitor is required from the input to ground to provide stability. low-esr ceramic capacitors provide optimal performance at a minimum of space. additional high- frequency capacitors, such as small-valued npo dielectric-type capacitors, help filter out high- frequency noise and are good practice in any rf- based circuit. output capacitor the mic5321 requires an out put capacitor of 1f or greater to maintain stability. the design is optimized for use with low-esr ceramic chip capacitors. high esr capacitors may cause high frequency oscillation. the output capacitor can be increased, but performance has been optimized for a 1f ceramic output capacitor and does not improve significantly with larger capacitance. x7r/x5r dielectric-type ceramic capacitors are recommended because of their temperature perform- ance. x7r-type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ce ramic capacitors. z5u and y5v dielectric capacitors change value by as much as 50% and 60%, respectively, over their operating temperature ranges. to use a ceramic chip capacitor with y5v dielectric, the value must be much higher than an x7r ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. bypass capacitor a capacitor can be placed from the noise bypass pin to ground to reduce output voltage noise. the capacitor bypasses the inte rnal reference. a 0.1f capacitor is recommended for applications that require low-noise outputs. the bypass capacitor can be increased, further reducing noise and improving psrr. turn-on time increases slightly with respect to bypass capacitance. a uniqu e, quick-start circuit allows the mic5321 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. refer to the typical characteristics section for performance with different bypass capacitors. no-load stability unlike many other voltag e regulators, the mic5321 will remain stable and in regul ation with no load. this is especially important in cmos ram keep-alive applications. thermal considerations the mic5321 is designed to provide 150ma of continuous current for both outputs in a very small package. maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the par t. given that the input voltage is 3.3v, the output voltage is 2.8v for v out1 , 2.5v for v out2 and the output current = 150ma. the actual power dissipation of the regulator circuit can be determined using the equation: p d = (v in ? v out1 ) i out1 + (v in ? v out2 ) i out2 + v in i gnd because this device is cmos and the ground current is typically <150a over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. p d = (3.3v ? 2.8v) 150ma + (3.3v -1.5) 150ma p d = 0.345w to determine the maximum ambient operating temperature of the package, use the junction-to- ambient thermal resistance of the device and the following basic equation: p d(max) = t j(max) - t a ja ? ? t j(max) = 125c, the maximum junction temperature of the die ja thermal resistance = 100c/w. the table below shows junc tion-to-ambient thermal resistance for the mic5321 in the thin mlf ? package. package ja recommended minimum footprint jc 6-pin 1.6x1.6 thin mlf ? 100c/w 2c/w thermal resistance
micrel, inc. mic5321 may 2008 10 m9999-051508-e substituting p d for p d(max) and solving for the ambient operating temper ature will give the maximum operating conditions for the regulator circuit. the junction-to-ambient thermal resistance for the minimum footprint is 100c/w. the maximum power dissipation must not be exceeded for proper operation. for example, when operating the mic5321-mfymt at an input voltage of 3.3v and 150ma loads at each output with a minimum foot print layout, the maximum ambient operating temperature t a can be determined as follows: 0.345w = (125c ? t a )/(100c/w) t a =90.5c therefore, a 2.8v/1.5v appl ication with 150ma at each output current can ac cept an ambient operating temperature of 90.5c in a 1.6mm x 1.6mm thin mlf ? package. for a full discussion of heat sinking and thermal effects on voltage regulators, refer to the ?regulator thermals? section of micrel?s designing with low-dropout voltage regulators handbook. this information can be found on micrel's website at: http://www.micrel.com/_pdf/other/ldobk_ds.pdf
micrel, inc. mic5321 may 2008 11 m9999-051508-e package information 6-pin 1.6mm x 1.6mm thin mlf (mt) 6-pin 1.6mm x 1.6mm mlf (ml)
micrel, inc. mic5321 may 2008 12 m9999-051508-e 6-pin tsot-23 (d6) micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web http:/www.micrel.com the information furnished by micrel in this data sheet is belie ved to be accurate and reliable. however, no responsibility is a ssumed by micrel for its use. micrel reserves the right to change circuitry and specificati ons at any time without notification to the customer. micrel products are not designed or authori zed for use as components in life support app liances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. li fe support devices or systems are devices or systems that (a ) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to resul t in a significant injury to the user. a purchaser?s use or sale of micrel products for use in life s upport appliances, devices or systems is a pu rchaser?s own risk and purchaser agrees to fully indemnify micrel fo r any damages resulting from such use or sale. ? 2006 micrel, inc.

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